Updated April 02, A functional dependency in a database enforces a set of constraints between attributes.
Functional dependency example, by A. Since the values of A are unique a1, a2, a3, etc.
Without normalization, there is no assurance that the data in a database is accurate and dependable. As you look at this table, ask yourself: What kind of dependencies can we observe among the attributes in Table R?
Equation for axiom of transitivity. Here are a few examples. The attribute SSN will determine the value of name, date of birth, address and perhaps other values, because a social security number is unique, while a name, date of birth or address may not be.
The table below has information not directly related to the student; for instance, ProgramID and ProgramName should have a table of its own.
Put another, more concrete way, if we know the value of the SSN attribute, we can find the value of name, date of birth and address.